Load flow calculation method of rectangular coordinate newton method

A technology of power flow calculation and Cartesian coordinates, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of non-convergence, poor convergence, and iterative increase.

Inactive Publication Date: 2014-09-03
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

However, as the scale of the power grid increases, the iterations of this method increase, and the convergence becomes poor, or even does not converge.

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  • Load flow calculation method of rectangular coordinate newton method
  • Load flow calculation method of rectangular coordinate newton method
  • Load flow calculation method of rectangular coordinate newton method

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Embodiment Construction

[0135] The present invention will be further described below in conjunction with the accompanying drawings. according to figure 1 The small impedance transformer model shown, using figure 2 The flow chart of the flow calculation of Cartesian coordinates Newton method is shown, and the flow calculation of an actual large-scale power grid is carried out. The actual large grid has 445 nodes and contains a large number of small impedance branches. Among them, there are 118 small impedance branches with x≤0.01, 49 small impedance branches with x≤0.001, 41 small impedance branches with x≤0.0001, and 22 small impedance branches with x≤0.00001. Among them, the smallest impedance value is the small impedance branch between node 118 and node 125 with x=0.00000001, transformation ratio k=0.9565, and k is located at the node 118 side. The convergence accuracy of the power flow calculation is 0.00001.

[0136] As a comparison, the conventional Cartesian Newton method power flow algori...

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Abstract

The invention discloses a load flow calculation method of a rectangular coordinate newton method. The load flow calculation method comprises the following steps: inputting original data and initializing a voltage; forming a node admittance matrix; calculating power and a voltage deviation; forming a jacobian matrix J; solving a modified equation and modifying a real part e and an imaginary part f of the voltage; and outputting nodes and branch data. The calculation formula of partial elements (i=j) of the jacobian matrix obtained in a manner of load flow calculation by utilizing the rectangular coordinate newton method is modified and improved, so that the problem of astringency of the load flow calculation of the rectangular coordinate newton method during the analysis of branch systems containing small impedance is solved. As compared with the fact that the astringency of the small impedance branch systems cannot be realized by adopting the load flow calculation of the conventional rectangular coordinate newton method, the reliable astringency of the small impedance branch systems can be realized by utilizing the load flow calculation disclosed by the invention; and the load flow calculation to normal systems can be carried out at the same time, so that harmful effects are avoided.

Description

technical field [0001] The invention relates to a power flow calculation method of a Cartesian coordinate Newton method in a power system, which is particularly suitable for the flow calculation of a branch system with small impedance. Background technique [0002] Power system power flow calculation is a basic calculation for studying the steady-state operation of the power system. It determines the operating state of the entire network according to the given operating conditions and network structure. Power flow calculation is also the basis of other power system analysis, such as safety analysis, transient stability analysis and so on. Due to the advantages of reliable convergence, fast calculation speed and moderate memory requirements, Newton's method has become the mainstream algorithm for power flow calculation. The Newton method is divided into two algorithms: the polar coordinate form and the rectangular coordinate form. Among them, the flow calculation of the rect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 姚玉斌吴志良王丹
Owner DALIAN MARITIME UNIVERSITY
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